[HOLD for payment 2025-08-13] Reduce the number of items rendered in the SelectionList initially

[mountiny]

Coming from here

Reduce the number of items in the selection list rendered initially to 50 instead of 500 as that is not necessary

Issue Owner

Current Issue Owner: @sakluger

[melvin-bot]

Triggered auto assignment to @sakluger (Bug), see https://stackoverflow.com/c/expensify/questions/14418 for more details. Please add this bug to a GH project, as outlined in the SO.

[MrMuzyk]

I've identified the issue that caused the PR to get reverted. We've settled down on the solution and I have opened a draft PR with it. Tomorrow in the morning I'll complete the checklist and move it to review.